M32CSLASH8B datasheet(278/406 Pages) RENESAS

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M32C/8B Group

18. A/D Converter

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 261 of 385

18.1.3

Single Sweep Mode

In single sweep mode, analog voltage applied to multiple selected pins is converted to a digital code once for

each pin.

Table 18.6 lists specifications of single sweep mode.

Table 18.6

Single Sweep Mode Specifications

Item

Specification

Function

Analog voltage applied to selected pins is converted once for each pin

Analog input pins

Select one of the following.

• 2 pins (ANi_0 and ANi_1) (i = none, 0, 2, 15)

• 4 pins (ANi_0 to ANi_3)

• 6 pins (ANi_0 to ANi_5)

• 8 pins (ANi_0 to ANi_7)

The following register settings determine which pins are used:

• Bits SCAN1 and SCAN0 in the AD0CON1 register

• Bits APS1 and APS0 in the AD0CON2 register

Start condition

Software trigger is selected (TRG bit in the AD0CON0 register = 0):

• The ADST bit in the AD0CON0 register is set to 1 (A/D conversion starts)

External trigger, hardware trigger is selected (TRG bit = 1):

• TRG0 bit in the AD0CON2 register = 0

The falling edge is detected on the ADTRG pin after the ADST bit is set to 1

• TRG0 bit = 1

Timer B2 interrupt request of three-phase motor control timer function (after

the ICTB2 register completes counting) is generated after the ADST bit is set

to 1.

Stop condition

• A sequence of A/D conversions is completed (the ADST bit becomes 0 when

software trigger is selected)

• Set the ADST bit to 0 by a program (A/D conversion stops)

Interrupt request generation timing • DMAC operating mode is not used (DUS bit in the AD0CON3 register = 0):

Interrupt request is generated after a sequence of A/D conversions is

completed.

• DMAC operating mode is used (DUS bit = 1):

Interrupt request is generated every time each A/D conversion is completed

Reading A/D conversion result

• DMAC operating mode is not used (DUS bit = 0):

Read the AD0j register (j = 0 to 7) corresponding to a selected pin by a

program.

• DMAC operating mode is used (DUS bit = 1):

A/D conversion result is stored into the AD00 register after A/D conversion is

completed. Then, DMAC transfers the data from the AD00 register to a given

memory space. (Refer to 13. DMAC for DMAC settings)

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